CVE-2026-49452

Published: Aug 18, 2026Modified: Oct 22, 2026Deferred

6.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Exploitability: 3.9 / Impact: 2.5

Source: security-advisories@github.com (Secondary)

Description

WeasyPrint helps web developers to create PDF documents. Prior to 69.0, WeasyPrint embeds unescaped HTML presentational-hint attribute values into CSS in weasyprint/css/__init__.py when presentational_hints=True. The background attribute is inserted into a background-image:url() declaration and parsed by tinycss2.parse_blocks_contents(), allowing untrusted HTML to inject additional CSS declarations. Applications that render untrusted HTML with presentational hints enabled can be affected by CSS injection and server-side requests through injected url() values. This issue is fixed in version 69.0.

Related CWEs

CWE-74

Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

References (5)

https://github.com/Kozea/WeasyPrint/commit/e158264e33fa399b29f415d30719c1d85a55df1d

Source: security-advisories@github.com

https://github.com/Kozea/WeasyPrint/pull/2773

Source: security-advisories@github.com

https://github.com/Kozea/WeasyPrint/releases/tag/v69.0

Source: security-advisories@github.com

https://github.com/Kozea/WeasyPrint/security/advisories/GHSA-jhhc-3hcp-qhm5

Source: security-advisories@github.com

https://github.com/Kozea/WeasyPrint/security/advisories/GHSA-jhhc-3hcp-qhm5

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Timeline

No history available yet.